July 6 (Reuters) - Canadian oil producer Paramount Resources Ltd said on Thursday that it would buy the Canadian subsidiary of U.S. oil and gas firm Apache Corp for C$459.5 million ($353.7 million USD).

The Calgary-based energy company plans to buy Apache Canada Ltd, and fund the deal with cash on hand and no debt. The deal requires regulatory approvals and is expected to close in August.

A sale of Apache Canada would mark the Houston-based company’s exit from the country, the latest international oil firm to sell Canadian operations in favor of concentrating on U.S. shale plays.

Apache has said it planned to streamline and focus on its operations in the United States, North Sea and Egypt.

Apache said with the sale to Paramount and two earlier deals signed in June involving Canadian assets, total proceeds from the three sales would amount to about $713 million.

It plans to use the funds finance a portion of Apache’s 2017-18 capital expenditures, reduce debt and improve the liquidity of the company. The sales will enable Apache to reduce “significant” liabilities associated with asset retirement obligations in Canada.

Separately, Paramount also said it entered into an agreement with petroleum and natural gas company Trilogy Energy Corp , in which the company would buy the remaining 85 percent of the common shares and non-voting shares of Trilogy. (Reporting by Aishwarya Venugopal in Bengaluru; Editing by G Crosse and Bill Trott)